chore: add project dependencies and configuration files

Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.

node_modules/axios/lib/cancel/CancelToken.js

@@ -0,0 +1,135 @@
+'use strict';
+
+import CanceledError from './CanceledError.js';
+
+/**
+ * A `CancelToken` is an object that can be used to request cancellation of an operation.
+ *
+ * @param {Function} executor The executor function.
+ *
+ * @returns {CancelToken}
+ */
+class CancelToken {
+  constructor(executor) {
+    if (typeof executor !== 'function') {
+      throw new TypeError('executor must be a function.');
+    }
+
+    let resolvePromise;
+
+    this.promise = new Promise(function promiseExecutor(resolve) {
+      resolvePromise = resolve;
+    });
+
+    const token = this;
+
+    // eslint-disable-next-line func-names
+    this.promise.then(cancel => {
+      if (!token._listeners) return;
+
+      let i = token._listeners.length;
+
+      while (i-- > 0) {
+        token._listeners[i](cancel);
+      }
+      token._listeners = null;
+    });
+
+    // eslint-disable-next-line func-names
+    this.promise.then = onfulfilled => {
+      let _resolve;
+      // eslint-disable-next-line func-names
+      const promise = new Promise(resolve => {
+        token.subscribe(resolve);
+        _resolve = resolve;
+      }).then(onfulfilled);
+
+      promise.cancel = function reject() {
+        token.unsubscribe(_resolve);
+      };
+
+      return promise;
+    };
+
+    executor(function cancel(message, config, request) {
+      if (token.reason) {
+        // Cancellation has already been requested
+        return;
+      }
+
+      token.reason = new CanceledError(message, config, request);
+      resolvePromise(token.reason);
+    });
+  }
+
+  /**
+   * Throws a `CanceledError` if cancellation has been requested.
+   */
+  throwIfRequested() {
+    if (this.reason) {
+      throw this.reason;
+    }
+  }
+
+  /**
+   * Subscribe to the cancel signal
+   */
+
+  subscribe(listener) {
+    if (this.reason) {
+      listener(this.reason);
+      return;
+    }
+
+    if (this._listeners) {
+      this._listeners.push(listener);
+    } else {
+      this._listeners = [listener];
+    }
+  }
+
+  /**
+   * Unsubscribe from the cancel signal
+   */
+
+  unsubscribe(listener) {
+    if (!this._listeners) {
+      return;
+    }
+    const index = this._listeners.indexOf(listener);
+    if (index !== -1) {
+      this._listeners.splice(index, 1);
+    }
+  }
+
+  toAbortSignal() {
+    const controller = new AbortController();
+
+    const abort = (err) => {
+      controller.abort(err);
+    };
+
+    this.subscribe(abort);
+
+    controller.signal.unsubscribe = () => this.unsubscribe(abort);
+
+    return controller.signal;
+  }
+
+  /**
+   * Returns an object that contains a new `CancelToken` and a function that, when called,
+   * cancels the `CancelToken`.
+   */
+  static source() {
+    let cancel;
+    const token = new CancelToken(function executor(c) {
+      cancel = c;
+    });
+    return {
+      token,
+      cancel
+    };
+  }
+}
+
+export default CancelToken;

node_modules/axios/lib/cancel/CanceledError.js

@@ -0,0 +1,25 @@
+'use strict';
+
+import AxiosError from '../core/AxiosError.js';
+import utils from '../utils.js';
+
+/**
+ * A `CanceledError` is an object that is thrown when an operation is canceled.
+ *
+ * @param {string=} message The message.
+ * @param {Object=} config The config.
+ * @param {Object=} request The request.
+ *
+ * @returns {CanceledError} The created error.
+ */
+function CanceledError(message, config, request) {
+  // eslint-disable-next-line no-eq-null,eqeqeq
+  AxiosError.call(this, message == null ? 'canceled' : message, AxiosError.ERR_CANCELED, config, request);
+  this.name = 'CanceledError';
+}
+
+utils.inherits(CanceledError, AxiosError, {
+  __CANCEL__: true
+});
+
+export default CanceledError;

node_modules/axios/lib/cancel/isCancel.js

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+'use strict';
+
+export default function isCancel(value) {
+  return !!(value && value.__CANCEL__);
+}